How much water flow does an open loop system require?

The water requirement of a specific model is
usually expressed in gallons per minute (gpm) and is listed in the unit’s
specifications. Generally, the average system will use 1.5 gmp per ton of
capacity while operating, but the amount of water required depends on the size
of the unit and the manufacturer’s specifications. Your contractor should be
able to provide this information. Your well and pump combination should be
large enough to supply the water needed by the heat pump in addition to your
domesting water requirements. You’ll probably need to enlarge your pressure
tank or modify your plumbing to supply adequate water to the heat pump.

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